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1. In bell shaped age pyramid, population is(a) Expanding (b) Stable (c) Declining(d) None of above
2. Estimate of actual number of individuals in a population(a) Relative density (b) Absolute density (c) Partial density(d) Economic density
3. Formula for logistic growth:a) dN/dt=rN(K-N/K) b) dN/dt=rN(N-N/K) c) dN/dt=rN(N-K/K) d) dN/dt=rN(1-N/K)
4. Select the negative factor for population density? 1. Emigration 2. Natality 3. Mortality 4. ImmigrationOptions: (a) 1 and 2 (b) 2 and 3 (c) 3 and 4(d) 1 and 3
5. Group of organism of the same species occupying a particular space(a) Population (b) Community (c) Ecosystem(d) Biosphere
6. Which of the following structures in a flower is responsible for the production of male gametes?(a) Ovary (b) Anther (c) Stigma (d) Style
7. In flowering plants, double fertilization involves:a) Fusion of one sperm with the egg and another with the polar nuclei b) Fusion of two sperms with the egg cell c) Fusion of one sperm with the antipodal cells d) Fusion of two polar nuclei with the egg
8. The process of transfer of pollen grains from the anther to the stigma of the same flower is called:(a) Xenogamy (b) Geitonogamy (c) Autogamy (d) Cleistogamy
9. Which of the following is NOT a part of the female reproductive unit in angiosperms?(a) Ovule (b) Filament (c) Nucellu(d) Embryo sac
10. Cleistogamous flowers are adapted for:a) Cross-pollination b) Self-pollination c) Wind pollination d) Water pollination
11. In an embryo sac, the cells that assist in guiding the pollen tube towards the egg are:a) Antipodal cells b) Polar nuclei c) Synergids d) Nucellar cells
12. The structure that connects the stigma to the ovary in a flower is:(a) Filament(b) Style (c) Petiole (d) Pedicel
13. Which of the following pollinating agents is responsible for hydrophily?(a) Wind(b) Water (c) Insects (d) Birds
14. After fertilization, the ovule develops into:(a) Seed (b) Fruit (c) Pericarp (d) Endosperm
15. In which type of endosperm development does cell wall formation occur immediately after each nuclear division?a) Nuclear endosperm b) Cellular endosperm c) Helobial endosperm d) Mosaic endosperm
16. The embryo sac of a typical angiosperm at maturity is:a) 8-nucleate, 7-celled b) 7-nucleate, 8-celled c) 6-nucleate, 7-celled d) 8-nucleate, 8-celled
17. Which of the following is a monocarpic plant?(a) Mango(b) Bamboo (c) Apple (d) Papaya
18. The process of appearance of recombination nodules occurs at which sub-stage of prophase-I of meiosis?a) Diplotene b) Zygotenec) Diakinesis d) Pachytene
19. Which one is correct about crossing over/ genetic recombination? (A) It occurs in tetrad stage. It occurs in pachytene stage of prophase-I of meiosis-I (B) It occurs between non-sister chromatids of homologous chromosomes. (C) It is a recombinase enzyme mediated process. (D) It is also the reciprocal transfer of genes between the non-homologous chromosomes.(a) All are correct (b) All except (d) (c) (b), (c) and (d) (d) (c) and (d)
20. Assertion (A): Meiosis maintains a fixed number of chromosomes in sexually reproducing organisms. Reason (R): First division of meiosis is heterotypic or reductional division.a) Both assertion and reason are true and reason is the correct explanation of assertion. b) Both assertion and reason are true but reason is not the correct explanation of assertion. c) Assertion is true but Reason is false. d) Assertion is true but Reason is true.